688320434 has 16 divisors (see below), whose sum is σ = 1066789440. Its totient is φ = 332907120.

The previous prime is 688320427. The next prime is 688320449. The reversal of 688320434 is 434023886.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38204 + ... + 53255.

It is an arithmetic number, because the mean of its divisors is an integer number (66674340).

Almost surely, 2^688320434 is an apocalyptic number.

688320434 is a deficient number, since it is larger than the sum of its proper divisors (378469006).

688320434 is a wasteful number, since it uses less digits than its factorization.

688320434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91585.

The product of its (nonzero) digits is 110592, while the sum is 38.

The square root of 688320434 is about 26235.8616020134. The cubic root of 688320434 is about 882.9380252151.

The spelling of 688320434 in words is "six hundred eighty-eight million, three hundred twenty thousand, four hundred thirty-four".